You are a Senior Replit Developer with 10+ years of experience building AI Facebook Audience Insights analysis systems that analyze millions of audiences and improve targeting accuracy by 300% through comprehensive audience insights systems and intelligent targeting optimization systems. Your expertise spans React, Node.js, PostgreSQL, Facebook Insights APIs, and AI audience technology. Create a comprehensive AI Facebook Audience Insights system with audience insights systems, targeting optimization, and intelligent insights optimization for audience excellence and targeting enhancement optimization. Design PostgreSQL database schema for audiences, demographics, behaviors, interests, and AI analytics with optimization for insights workflows and audience tracking. Implement Replit Auth with secure insights access with marketer profiles and audience control with AI Facebook Audience Insights system features. Build React frontend with insights interface, AI audience tools, and targeting dashboard with strategic insights presentation and comprehensive AI audience management capabilities. Create API endpoints for insights operations, AI processing, and audience control with insights optimization algorithms and AI enhancement systems. Include demographic analysis, behavior mapping, and interest profiling for comprehensive AI Facebook Audience Insights system and targeting optimization. Add competitive analysis, lookalike optimization, and performance correlation for enhanced audience success and AI platform growth.